Thank you Capchee,for that bit of info,I have for years, used the hammer to ''fit ''the cap down on my nipple,MIND YOU,I always make sure the weapon is in a safe direction,and or/downrange,Which,of course,I would alway's check in any event,when prepping my weapon.The nipples I presently use are all tight this way and if it is not done there will be a misfire as the first strike will be ''soft''due to the cap not being down tight.I have had nipples that were loose and cured this by shaving a bit of nipple hieght off which brings the cap down to the wider base .A file works great at this.